LED backlight driver

19 August 2009 Opto-Electronics

Analog Devices has expanded its lighting management system (LMS) product lineup with the new ADP8860 white LED (WLED) backlight driver – the first member of a new family of charge pump-configuration devices.

Designed to operate with sister LMS products, such as the ADP5520 lighting management system and ADP5588 mobile I/O expander, the ADP8860 features ambient light sensing, a highly programmable register set, and sophisticated fading and dimming options to reduce backlight power dissipation. This flexible architecture targets a broad range of products that require backlighting for small-format displays and/or keypads found in consumer, medical, industrial and instrumentation electronics devices.

For challenging applications such as maritime and portable navigation devices, radar scanners and consumer handsets, which require consistent display viewing in a variety of ambient lighting environments, the ADP8860 supports 1,7 to 3,3 V I/O operation. The device automatically detects ambient light levels and adjusts backlighting brightness according to changing light conditions. Multizone lighting capability is also available to support the main display, as well as other displays including navigation, special functions, keypad and indicator displays.

Featuring a parallel configuration, the single-chip ADP8860 can control up to seven LEDs – six at 30 mA maximum and one at 60 mA – enabling dimming and fade-in/fade-out capabilities. Designers can configure a small group of LEDs to backlight the display, and assign individual LEDs to drive keypad lighting, and network connectivity and charge indicator lights. The backlight driver also enables system designers to upgrade non-LMS devices to provide the desired fading and dimming functions.

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